AOAC Test Method 993.3


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Analytical testing dots

Source:
AOAC

Method Name:
Inorganic Anions in Water. Official Name: Inorganic Anions in Water by Ion Chromatographic Method

Description:
Anions in test sample are separated by ion chromatographic system containing guard column, separator column, and suppressor device and are measured using conductivity detector.

Scope:
Applicable to determination of bromide, chloride, fluoride, nitrate-N, nitrite-N, orthophosphate, and sulfate in drinking water and wastewater in the range shown in Table 993.30A.

Citation:
Official Methods of Analysis of AOAC International, 16th Edition, 4th Revision, 1998 Volume I

Interferences:
(1) Coeluting species (e.g., low-molecular-weight organic acids). (2) High concentration of anion can effect resolution of peaks and elution times. (3) Fluoride is especially sensitive to coeluting species, and "water dip" (corresponding to the elution of water) at low concentrations.

QC Requirements:
IDLC, LFB (4), LRB, FMR, FD, CV, QCS, PE (recommended)

Maximum Holding Time:
48 hours (NO2, NO3, orthophosphate) 28 days (others)

Media:
WATER

Subcategory:
Inorganic

Concentration:
0.3 - 100ug/L. Ranges differ for each analyte. This range is taken from the lowest and highest limit of the analytes listed in the method.

Precision:
-

Detection:
Lowest level from calibration range of the method.

Revision Number:
Final Action - 1997

Analytical testing dots

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Analytical testing dots